Question

How are the worn knees on the trousers of the pawnbroker’s assistant a clue to the mystery?
A.
They indicate the assistant may be poor and therefore have a motive for robbery.
B.
They indicate that the assistant has been working at an activity on his knees such as digging a tunnel.
C.
They are part of a disguise to throw off suspicion.
D.
They suggest he has been in a fight and may be untrustworthy.